Spatial entanglement of paired photons generated in cold atomic ensembles
Physical Review A—Atomic, Molecular, and Optical Physics, 2008•APS
Cold atomic ensembles can mediate the generation of entanglement between pairs of
photons. Photons with specific directions of propagation are detected, and the entanglement
can reside in any of the degrees of freedom that describe the whole quantum state of the
photons: polarization, spatial shape, or frequency. We show that the direction of propagation
of the generated photons determines the spatial quantum state of the photons and,
therefore, the amount of entanglement generated. When photons generated in different …
photons. Photons with specific directions of propagation are detected, and the entanglement
can reside in any of the degrees of freedom that describe the whole quantum state of the
photons: polarization, spatial shape, or frequency. We show that the direction of propagation
of the generated photons determines the spatial quantum state of the photons and,
therefore, the amount of entanglement generated. When photons generated in different …
Cold atomic ensembles can mediate the generation of entanglement between pairs of photons. Photons with specific directions of propagation are detected, and the entanglement can reside in any of the degrees of freedom that describe the whole quantum state of the photons: polarization, spatial shape, or frequency. We show that the direction of propagation of the generated photons determines the spatial quantum state of the photons and, therefore, the amount of entanglement generated. When photons generated in different directions are combined, this spatially distinguishing information can degrade the quantum purity of the polarization or frequency entanglement.
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